Refs. swh/devel/swh-lister#1800

Summary: Lister to ingest fedora mirrors (.rpm)

Reviewers: #reviewers, vlorentz

Subscribers: vlorentz, olasd

Maniphest Tasks: T4448

Differential Revision: https://forge.softwareheritage.org/D8386

Instead of using an undocumented rubygems HTTP endpoint that only
gives us the names of the gems, prefer to exploit the daily PostgreSQL
dump of the rubygems.org database.

It enables to list all gems but also all versions of a gem and its
release artifacts. For each relase artifact, the following info are
extracted: version, download URL, sha256 checksum, release date
plus a couple of extra metadata.

The lister will now set list of artifacts and list of metadata as extra
loader arguments when sending a listed origin to the scheduler database.
A last_update date is also computed which should ensure loading tasks
for rubygems will be scheduled only when new releases are available since
last loadings.

To be noted, the lister will spawn a temporary postgres instance so this
require the initdb executable from postgres server installation to be
available in the execution environment.

Related to T1777

xmltodict cannot parse POM files with multi-byte encoding so prefer to
use the XML parser of BeautifulSoup based on lxml instead.

Also drop xmltodict requirement as it is no longer used in swh-lister
codebase.

Add incremental mode support based on a 'last_commit' state, used to get
new package versions from git diff range of commits.

Fix sourceforge origin URL for bzr projects,
http://project.bzr.sourceforge.net/bzrroot/project
redirects to http://project.bzr.sourceforge.net/bzr/project.

Handle bzr projects with multiple branches, one listed origin
must be created per branch.

Discard bzr projects that no longer exist from listing.

The Maven lister retrieves the maven central indexes, exports them in a
convenient text format, and parse them to identify all src archives and
pom files in the maven repository. Then the pom files are downloaded and
analysed to find and yield any scm reference.

Note: This is a new version of the maven lister diff D6133 which takes
into account the initial round of reviews.

Related to T1724

xmltodict now raises an error while trying to parse the HTML content
of https://pypi.org/simple/ page.

So use BeautifulSoup HTML parser instead as it is aleady a requirement
of swh-lister and it does not fail parsing the PyPI HTML page.

Also drop no longer used xmltodict in requirements.

Legacy Lister classes from the swh.lister.core mdule are no longer
used in swh-lister codebase so it is time to remove them.

Also remove lister CLI options related to legacy Lister API.

As a consequence, the following requirements are no longer needed:
arrow, SQLAlchemy, sqlalchemy-stubs and testing.postgresql.

Closes T2442

Port launchpad lister to the swh.lister.pattern.Lister API.

Last update date of each listed git repositories is now sent to the scheduler.

The lister can work in incremental mode, only modified repositories since
the last listing operation will be returned in that case.

Closes T2992

Related bb5d405